Do you know of any geophysical interpretation packages written for Mac?
That's a pretty broad category. We have Google Earth for Mac, and I've written 3-D mapping software on Macs. Is there a specific software package you can refer me to for further research?
The new Intel-based Macs can run Windows XP and Linux too, in dual-boot or virtualized environments, so your geophysical interpretation software should work too.
For that sort of software, a Mac Pro would be the best model. It's expected to be announced on August 7th. We don't know which Intel processors it will use yet, but it could be Core 2 Duos, Core 2 Extremes, Woodcrests or Conroes.